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Lively Pulley: The “enter” pulley in a twin-pulley system. The shaft of this pulley is pushed by something like a motor, a crank, or maybe an additional pulley in larger techniques. This pulley controls the movement of the belt.
Movable Pulley: A pulley that rotates and translates in accordance to the movement of the pulley or belt. This is generally employed in blocking and deal with programs, which I will clarify afterwards.

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